Sub-Pixel Accuracy

The Image Registration tool determines the sub-pixel location at which the normalized correlation coefficient is the highest between the reference image pixels and the run-time image pixels. You can select the method that the tool uses to compute this sub-pixel location:

Standard mode uses a basic mathematical model for estimating the sub-pixel position with the highest score.
High-Accuracy mode computes the sub-pixel location of the correlation score peak using a mathematical model that better characterizes how the normalized correlation coefficient changes at small sub-pixel image offsets. (Standard mode uses a mathematical model that may not accurately model changes in the correlation score at small image offsets.)